I bought my Bigfoot from a guy who lived on the California Coast. For the most part everything was in great shape but all of the screws on the exterior had significant rust issues. I started going through and replacing them all with stainless steel ones and scratched my head wondering why they were not stainless in the first place. I e-mailed Grant from Bigfoot and asked him the question and he said that it was shortly after mine was built (2001) that they started using stainless fasteners on the exterior.
Right now so far as I can tell everything is water tight but I do have it on my todo list to work on replacing my windows in the future. I suspect I will see some water related issues just because of the condensation from the aluminum frames on cold days will expose the plywood backing to water regardless if the window leaks. Still, I don't think there will be any structural issues like a stick frame camper would likely have.
Us fiberglass owners are quite proud of our better than average water resistance but proper storage and maintenance are key to maintaining that. Not everyone can afford indoor storage but I feel more than anything, it is the key to proper long life. Just drive by an RV outdoor storage yard and there are rows and rows of expensive dreams that are slowly being beaten to death by the elements. Some areas of the country are harder than others. Condensation and moisture buildup isn't a problem on the West coast as compared to areas in the South.
